San Diego again lightly shaken by Mexico earthquake

A magnitude 5.0 earthquake occurred at 11:34 a.m., 39 miles south-southeast of Calexico, not far from where a 5.1 quake hit on Friday, says the U.S. Geological Survey. Both quakes are aftershocks to the 7.2 quake that erupted in that region of northern Baja California on Easter Sunday last year.

This is the 10th aftershock to measure in the 5.0 to 5.7 range.

Bob Dollar, a USGS seismologist, said after Friday's shaker, "The aftershock sequence from that (Easter Sunday) quake has been very active. But the bigger the quake you have, the more aftershocks there are. The aftershocks just haven't stopped. This is normal."